Air-pump for automobiles and the like.



V. H. PETERSON. AIR PUMP FOR AUTOMOBILES AND THE LIKE;

APPLICATION FILED NOV- 4, 1914.

Patented Feb. 1, 1916.

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THE COLUMBIA PLANOGRAPH $20., WASHINGTON, D C.

VICTOR I-I. PETERSON, OF CAMBRIDGE, MASSACHUSETTS.

AIR-PUMP FOR AUTOMOBILES AND TI-IE LIKE.

Application filed November 4, 1914.

To all whom it may concern Be it known that I, VIo'roR H. PETERSON, asubject of the King of Sweden, residing at Cambridge, in the county ofMiddleseX and State of Massachusetts, have invented new and usefulImprovements in Air-Pumps for Automobiles and the like, of whichthefollowing is a specification.

This invention relates to improvements in air pumps.

More particularly it relates to air pumps designed for attachment toautomobiles or the like.

It is among the objects of the invention to provide such a pump at smallexpense, and of such small dimensions that it can be installed inautomobiles that were not originally designed with a place for a pump;and that will, withal, be a practical, efiicient and durable piece ofmechanism. These objects are accomplished by the constructionhereinafter disclosed.

It is the further object of the invention to provide apparatus withother advantages that characterize the construction herein set forth;and it is the object to cover by the appended claims whatever featuresof patentable novelty exist in the invention disclosed.

In the accompanying drawings, which illustrate an embodiment of theinvention:

Figure 1 is an end elevation with part broken away in section to thegroove 31 of Fig. 2; Fig. 2 is a side elevation in medial section; Fig.3 is a plan in section on the line 33 of Fig. 2; and Fig. l is a sectionthrough the cylinder at the line 4l4 of Fig. 2.

Upon referring to the drawings the compactness of mechanism madepossible by the invention will be understood when it is known that inthe drawing accompanying the application for patent the parts are drawnon a full size scale. As depicted, the apparatus has a base formed oftwo parts 10 and 11 fastened together by any convenient means as byscrews 12 in such mannerthat other position where it is out of mesh. To

effect this movement a fork 17 en 'a es in a Specification of LettersPatent.

Patented Feb. 1, 1916.

Seria1No. 870,279.

groove 18 on the hub of the driving gear, the shank of the fork beingarranged to slide on a stationary pin 19; and a handle 20, which mayconveniently be merely a screw with knurled head, enables the operatorto slide the fork and gear on the two pins 19 and 14 at will. Forlocking the gear in position in mesh, or out of mesh, a set screw 21 maybe provided to pass through the shank of the fork and engage thestationary pin 19. The gear carries a driving pin 22 which preferablyhas a sleeve mounted loosely upon it to act as a roller in contact withthe piston rod which this pin drives.

The other portion of the base has a standard 24 rising to support aplatform 24: on which a cylinder 25 is fastened by clamping bolts 26. Inthe cylinder is a piston 27 having a piston rod 28 passing through asuitable bearing in said platform, and having a cross head 29 in whichis a slot 30 extending at right angles to the line of movement of thepiston and adapted to receive the roller 23 on the driving pin of thegear. This cross head is of such width that its edges ride in groovebearings 31 in the standard 24. The upright part of the standard 2%preferably is continuous around three sides, thus affording protectionto the interior mechanism, and afiording protection for fingers of theoperator; while on the fourth side it is open for the insertion and playof the driving pin. Preferably the platform 24 stands up high enough topermit the gear 15 to slide under it, so that when the gear is in mesh,the gear is close to the cross head 29 with the driving pin 22projecting through the cross head. This gives application of power withrelatively little distortion. When out of mesh the gear is farther awayfrom the cross head; and the driving pin is long enough so that it doesnot pull out of the slot in the cross head. Hence it is always inposition to be pushed into it to its working position.

The cylinder has a single acting piston 27 having a cup packing. Beyondthe inner end of stroke is located a discharge port 32, closed by aspring pressed ball constituting a check valve operating in a chamber 3%whence adischarge pipe 85 leads for conveying the compressed air to anydestination. At the other end of the cylinder are a multiplicity ofports arranged at two different levels, the ports 36 being air inlets tothe upper side of the piston when it is at its extreme limit of outwardstroke, and the ports 37 being open to the under side of the piston atall times.

The operation of the device is as follows: On the inward stroke of thepiston the cup packing is tight against the cylinder walls, air iscompressed against the head end of the cylinder, and greater part ofthis air is forced out through the discharge port 32. On the outwardstroke of the piston the tendency to create a vacuum in the cylinderdraws some air past the edges of the cup packing; and the filling of thecylinder with air at atmospheric pressure is completed when the pistonhas reached its outer limit of stroke, at which place air can enterfreely through the inlet ports 36. Early in the inward stroke theseports are shut off; and the air thus entrapped is compressed anddischarged through the port 32 and pipe 35. As the platform 24E closesthe mouth of the cylinder air is drawn into it through the ports 37 oneach inward stroke of the piss ton, and is forced out again on thesucceeding outward stroke. The temperature re sulting from thecompression of the air is prevented from heating the apparatus unduly,owing to the cooling draft of air which is thus drawn into the cylinderand forced out again at each stroke, on the outer side of the piston.Suitable oil holes, which may be simple openings 38 through the sides ofthe standard and cylinder, provide easy means for lubrication.

It is contemplated that the power gear 16 for driving the apparatus maybe mounted on the magneto shaft or cam shaft or any other suitable placeon an automobile, and that the pump may be placed in proximity theretoby any means of support that may happen to be obtainable. Although ithas been spoken of herein as being set and operating vertically, whichis the arrangement illustrated and which is generally to be preferred,it is to be understood that it may be set and operated at any angle. Thedistance of travel of the driving gear between its meshed and unmeshedpositions is so slight that the stud on which it is mounted can be heldstifliy from a single standard 13. The compactness of the parts is suchthat this standard and stud are easily held .in rigid relation to thecross head and piston guides by the device of making a base in two.sections attached together as shown. The cylinder is likewise held insufficiently accurate alinement considering the nature of the pistonpacking, by the ease with which it can be secured on the platform 24;,integral with the'cross head guides on the part 11 of the base, as shownin the drawin As there is no joint between the piston head and thepiston rod; and as the piston rod is kept in an approximatelyrectilinear path by the grooves and bearing, the leather cup style ofpacking for the piston permits the piston to fit tightly even when thesebearings have become somewhat loose by wear. The alinement of piston:rod and guide grooves and piston is easily fixed at the outset. Theproblem is further simplified by the roller drive, so that frictionoccasioned by theoscillation of the roller 23 toward either side is oflittle consequence, and slight imperfection of fit makes no particulardifference because the main bearing surface is between the roller .43and its pin 22, i place where a good fit is easily made. constructingthe pump very little machine work is therefore necessary; and much ofthat does not need to be of the highest order of precision, and is inplaces which are easily accessible. The construction by which base part10 underlies and is separable from the base part in which the cross headgrooves run to the bottom permits of easy manufacture and assembly; andthe fastening of both base parts to each other by the screws 12, andboth to the same support by screws through the holes seen in the cornersin Fig. 3 makes. the pump as a whole both easily separable and verysturdy.

The pump is reversible,running in either direction with equal effect. 7

An extension from the handle 20 to the operators seat may be provided,so that the gear can be put into or out of mesh: without leaving thecar.

I claim as my invention:

1. An air pump comprising a standard combined integrally with a basepart and adapted to guide a cross head and to support a cylinder; saidcylinder; a piston in it; a piston rod and cross-head guided in saidstandard; another standard, integral with another base part; and meanssup-. ported thereon to engage. and drive said piston rod; said twoparts of the base being separably joined together with their bot-v tomsin the same plane and with said driving means between their parts thatextend thence upward for said supporting purposes.

2. An airpump comprising a standard, with guide grooves foroppositeedges. of a cross-head, extending to the bottom of the standard, abearing for a sliding piston'rod, and means to support a cylinder; saidcylinder; said piston rod, with cross-head; a piston thereon in thecylinder; means under the cylinder for engaging and driving saidcross-head; the said standard having upright portions on the two sideswhere. the guide grooves are, and a horizontal portion adapted forattachment tov a support on, the

third side; and a standard for saiddriving driving means movable towardand fromthe path of the cross-head and having a driving part always inmesh in said slot of the cross-head.

a. An air pump comprising a standard with guide grooves for oppositeedges of a cross-head, a bearing for a sliding piston rod, and means tosupport a cylinder; said cylinder; said piston rod with cross-headhaving a slot extending transversely; a stud and means to support it; agear movable on the stud toward and from the path of the cross-head; anda driving pin on the gear, having a rolling casing engaging in saidslot.

5. An air pump comprising a standard with guide grooves for oppositeedges of a cross-head, a bearing for a sliding piston rod, and means tosupport a cylinder; said cylinder; a piston having a cup-bearing in thecylinder; said piston rod with cross-head guided in a rectilinear pathby said grooves and bearing; and a driving member engaging thecross-head and rolling thereon transversely of its path while driving itlongitudinally of said path.

6. An air pump comprising a standard with means for guiding a piston rodand for supporting a cylinder; said cylinder, having ports at its endtoward the standard; a piston in the cylinder over-traveling one of saidports for admission of air to be compressed and not over-travelinganother port, whereby cooling air enters and leaves back of the pistonthrough the latter port; a discharge port at the other end of thecylinder, with valve; and driving means for the piston.

7. An air pump comprising a two part base, each part being attached tothe other and both being adapted to be attached to a support in the sameplane; there being on one of said parts a plunger pump, and on the otherof said parts driving mechanism continually in mesh therewith.

V Signed by me at Boston, Mass, this second day of November, 1914.

VICTOR H. PETERSON.

Vitnesses JosErrI T. BRENNAN, EVERETT E. KENT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

